PARKLAND, Fla. (AP) — The Florida sheriff whose department responded to this month’s high school massacre defended his leadership Sunday while insisting that only one of his deputies was on the scene as the gunman killed 14 students and three staff members.

Broward County Sheriff Scott Israel told CNN that investigators are looking into claims that three other deputies were on the scene but failed to enter the school when the chance to save lives still existed. To date, the...